If an individual inherits only one recessive allele of the gene, the individual is considered a carrier who can pass on the illness to their offspring.
But when an individual inherits two copies of a dangerous recessive allele, they the gene is said to be unmasked and inherit the condition. Trouble is, cousins share one set of grandparents. So the risk of a child inheriting two copies of a dangerous allele is elevated compared to non-related marriages since they have a greater chance of inheriting the same recessive allele from their common ancestors.
Nevertheless, British authorities determined that despite the increased risk, most children of cousin marriage are healthy.
Bittles and M. Black tackled consanguineous marriage on a global scale in a paper in Annual Review of Anthropology. For the reasons discussed above, beyond just dangerous recessive alleles, the odds of a child of first cousins inheriting two copies of the same allele—any allele, whether recessive or not—is elevated.
Populations with fewer consanguineous marriages have higher heterozygosity, meaning individuals carry two different alleles for a given gene. Unmasking is less common in highly heterozygous populations, so according to Bittles and Black, as cousin marriage declines, there should be corresponding increases in human health at a population level. The bottom line is that it is often safe to have children with your cousin, but doctors do recommend genetic counseling for prospective first cousin parents.
Blame Brussels. Trending 1. Fiona Hill: U. Latest Analysis. Andrew Connelly. Or are they? The Month in World Photos. Trending Fiona Hill: U. Analysis Jeffrey Wilson. Have you seen Japan's birthrate? I'm pretty they would be happy with any relationship as long as it produces a child. Historically wise yes but in certain areas. Besides the whole archaic close knit clan era stuff of centuries ago that would lead to cousin marriages and what not, the whole taboo incest thing spawned from times in the past where right of passage for a male in the house sometimes it was okay'd for him to 'sneak into the sisters room' and even in rural areas where the head male might have died, the son might assume command of the home by sexually taking control of the mother and or sister.
These are old cultural things but some of it might still have been carried down. Also its noted by records from abuse hotlines that young males have called in confessing to being sexually serviced by their moms to avoid them from being distracted by school girls in order to study to get into the most prestigious schools.
Fathers working long hours and going to host clubs and soapbars and what not, also would not help matters and the bonds between siblings and or mother would then increase. There's even rare taboo "mama clubs" in Japan where mom and son couples go to. These are why there is such a popular fetish for such things in fiction in Japan because it partially stems from historical reality Sometimes Japan sounds like such a magical place.
User Info: Edgeknight. Legal but still icky Just like half the states "I'm not a newbie it's just that I only registered a few days ago. User Info: MasterSpectrobe. Romaji posted
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